<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="(carInfo,index) in  cartInfoList" :key="carInfo.id">
          <li class="cart-list-con1">
            <!--使用change事件监听input单选框的改变 -->
            <input type="checkbox" name="chk_list" v-model="carInfo.isChecked" @change="changeCheck(carInfo,$event)">
          </li>
          <li class="cart-list-con2">
            <img :src="carInfo.imgUrl">
            <div class="item-msg">{{carInfo.skuName}}</div>
          </li>
          <li class="cart-list-con3">
            <div class="item-txt">语音升级款</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{carInfo.skuPrice}}.00</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="updateSkuNum(carInfo,-1,'miune')">-</a>
            <input autocomplete="off" type="text" :value="carInfo.skuNum" minnum="1" class="itxt" @input="updateSkuNum(carInfo,$event.target.value*1,'input')">
            <a href="javascript:void(0)" class="plus" @click="updateSkuNum(carInfo,1,'add')">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{carInfo.skuNum*carInfo.skuPrice}}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="delectShop(carInfo)">删除</a>
            <br>
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" v-model="isChecks" @change="updateAllChecked">
        <span>全选</span>
      </div>
      <div class="option">
        <a  @click="deleteCheckShop">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{cartInfoList.length}}</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapGetters} from 'vuex'
import throttle from 'lodash/throttle'
  export default {
    name: 'ShopCart',
    methods:{
      getShopCartData(){
        this.$store.dispatch('getShopCartList')
      },

     updateSkuNum:throttle (async function(carInfo,disNum,flag){
          switch(flag){
            case 'add':
              disNum = 1;
              break;
            case "miune":
              if(carInfo.skuNum < 1){
                disNum = 0
              }else{
                disNum = -1
              }
              break;
            case "input":
              if(isNaN(disNum)||disNum<1){
                    disNum = 1
              }else{
                // 移动的数组等于当前输入框的数字减去之前携带过来数字
                disNum = parseInt(disNum) - carInfo.skuNum
              }
              break;
          }
          try{
            // 判断是否发送添加成功 前往购物车
            await this.$store.dispatch('goShopCart',{skuId:carInfo.skuId,skuNum:disNum})
            // 添加成功后要重新渲染页面所以重新发送请求(购物车列表)
            this.getShopCartData()
          }catch(error){
              alert('修改成功')
          }
      },500),
    // 删除单个商品
   async delectShop(carInfo){
        try{
            await this.$store.dispatch('deleteCart',carInfo.skuId);
            this.getShopCartData();
        }catch(error){
          alert('删除成功')
        }
    },
    // 当单选框都选中时全选框也被选中  当有一个不被选中的时候  全选框取消选中
   async changeCheck(carInfo,event){
      // 收集当前点击之后的单选框是0还是一
     
      let isChecked = event.target.checked?"1":"0";
       console.log(isChecked)
      // 收集之后发请求并携带参数
      try{
         await this.$store.dispatch('updateChecked',{
            skuId:carInfo.skuId,
            isChecked
          })
          // 修改的请求发送成功后就再次发送购物数据的请求后再次渲染页面
          this.getShopCartData()
      }catch(error){
        alert('修改勾选状态失败')
      }
         
    },
    // 给复选框添加点击事件并求改变单选框的checked
  async updateAllChecked(event){
      let isChecked = event.target.checked ?'1':'0'
        try{
          // 因为后台只有单选框的接口所以需要在库里面调用单选框的接口
          await this.$store.dispatch('updateAllCart',isChecked);
          this.getShopCartData();
        }catch(error){
          alert('修改失败')
        }
   },
   //  删除选中的商品
   async deleteCheckShop(){
          try{
            await this.$store.dispatch('deleteCartByChecked');
            this.getShopCartData()
          }catch(error){
            alert('删除失败')
          }
   }
   },
  
    mounted(){
      this.getShopCartData()
    },
    computed:{
        ...mapGetters(['shopCartData']),
        cartInfoList(){
          return this.shopCartData.cartInfoList || []
        },
        // 计算商品的总和
        totalPrice(){
            let sum = 0;
            this.cartInfoList.forEach((item)=>{
                sum += item.skuNum*item.skuPrice
            })
            return sum
      },
      isChecks:{
        get(){
          // 返回值是 boolean 值  所有的单选框是选中的并且数组长度 > 0 的时候  多选框才会被选中
             return this.cartInfoList.every((item)=>item.isChecked == 1) && this.cartInfoList.length>0
        },
        set(val){
            return 
         }
      }
    },
  }
</script>

<style lang="less" scoped>
  .cart {
    width: 1200px;
    margin: 0 auto;

    h4 {
      margin: 9px 0;
      font-size: 14px;
      line-height: 21px;
    }

    .cart-main {
      .cart-th {
        background: #f5f5f5;
        border: 1px solid #ddd;
        padding: 10px;
        overflow: hidden;

        &>div {
          float: left;
        }

        .cart-th1 {
          width: 25%;

          input {
            vertical-align: middle;
          }

          span {
            vertical-align: middle;
          }
        }

        .cart-th2 {
          width: 25%;
        }

        .cart-th3,
        .cart-th4,
        .cart-th5,
        .cart-th6 {
          width: 12.5%;

        }
      }

      .cart-body {
        margin: 15px 0;
        border: 1px solid #ddd;

        .cart-list {
          padding: 10px;
          border-bottom: 1px solid #ddd;
          overflow: hidden;

          &>li {
            float: left;
          }

          .cart-list-con1 {
            width: 4.1667%;
          }

          .cart-list-con2 {
            width: 25%;

            img {
              width: 82px;
              height: 82px;
              float: left;
            }

            .item-msg {
              float: left;
              width: 150px;
              margin: 0 10px;
              line-height: 18px;
            }
          }

          .cart-list-con3 {
            width: 20.8333%;

            .item-txt {
              text-align: center;
            }
          }

          .cart-list-con4 {
            width: 12.5%;

          }

          .cart-list-con5 {
            width: 12.5%;

            .mins {
              border: 1px solid #ddd;
              border-right: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }

            input {
              border: 1px solid #ddd;
              width: 40px;
              height: 33px;
              float: left;
              text-align: center;
              font-size: 14px;
            }

            .plus {
              border: 1px solid #ddd;
              border-left: 0;
              float: left;
              color: #666;
              width: 6px;
              text-align: center;
              padding: 8px;
            }
          }

          .cart-list-con6 {
            width: 12.5%;

            .sum {
              font-size: 16px;
            }
          }

          .cart-list-con7 {
            width: 12.5%;

            a {
              color: #666;
            }
          }
        }
      }
    }

    .cart-tool {
      overflow: hidden;
      border: 1px solid #ddd;

      .select-all {
        padding: 10px;
        overflow: hidden;
        float: left;

        span {
          vertical-align: middle;
        }

        input {
          vertical-align: middle;
        }
      }

      .option {
        padding: 10px;
        overflow: hidden;
        float: left;

        a {
          float: left;
          padding: 0 10px;
          color: #666;
        }
      }

      .money-box {
        float: right;

        .chosed {
          line-height: 26px;
          float: left;
          padding: 0 10px;
        }

        .sumprice {
          width: 200px;
          line-height: 22px;
          float: left;
          padding: 0 10px;

          .summoney {
            color: #c81623;
            font-size: 16px;
          }
        }

        .sumbtn {
          float: right;

          a {
            display: block;
            position: relative;
            width: 96px;
            height: 52px;
            line-height: 52px;
            color: #fff;
            text-align: center;
            font-size: 18px;
            font-family: "Microsoft YaHei";
            background: #e1251b;
            overflow: hidden;
          }
        }
      }
    }
  }
</style>